Question

the weight of 10 student is 35kg if the 11 th student weight is 42 kg find. the mean of observation

Answer 1

Sum of weights = 10 * 35 + 42 = 392 .

Number of students = 11 .

Arithmetic mean = 392/11 = 35.7 kg

Answer 2

Total students =10
Weight =35
10*35=350
1stu add 350+42=392
Now total students =11
So mean =392/11=35.63